Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Ground lease expense incurred $ 102,000 $ 127,000 $ 203,000 $ 286,000
Property Lock-Ups [Member]
       
Properties aggregate net book value     132,800,000  
Expiration year     2016  
Number of properties 7   7  
Property Lock-Ups Expired [Member]
       
Properties aggregate net book value     1,800,000,000  
Number of properties 129   129  
Harborside Plaza 4-A Agreement [Member]
       
Project period (years)     20  
Percentage of PILOT on project cost     2.00%  
Total project cost     49,500,000  
Payments in lieu of property taxes (PILOT) 247,000 275,000 495,000 550,000
Harborside Plaza 5 Agreement [Member]
       
Project period (years)     20  
Percentage of PILOT on project cost     2.00%  
Total project cost     170,900,000  
Payments in lieu of property taxes (PILOT) $ 854,000 $ 798,000 $ 1,700,000 $ 1,600,000